I contacted a total of 6 companies and gathered 5 bids. Brands of windows that I was presented with: Amerimax, Aniline, Simmonton, Polybau and Milgard.

As far as the quality of the window goes, they are all very close with the exception of Milgard. Price range of $13K to $15K+. But price is only 30% of my deciding factor while company's reputaion/credential represents a whopping 40% and salesmanship is another 20%.

To make a long story short, I've learned a lot from all the threads other people have posted here and am able to form an educated opinion. THanks guys!

That price is fine. You have some very large openings, plus the door. The garden windows are pretty expensive, too. Be careful. many garden windows leak. Not saying they WILL but it's not uncommon.
Amerimax and Polybau would get my attention over the others.

I just had my 5th and last visit from a contractor, using Amerimax window. And he brought up a couple points for me to consider:

1. The large windows I have are dual double hungs flanking a picture window. The contractor said that H frames are used to put the 3 pieces together on job site, as Amerimax does not fab them as one unit, not yet anyways. Is this true? Is this bad if ture?

2. His company uses polyurethane instead of 100% silicon sealant. Is that better?

Overall all the reps were very professional, two of them didn't even do any sales pitch. Price ranges were $14K to $19+. But the $19+ one was in a league of its own based on product and construction method, so I really couldn't make a fair comparision.

I'm no sealant expert, but tires are made of polyeurothane, and they seem pretty resilient to me.

As far as on the job fabrication, again, I'm no authority, but it seems to me fitting the pieces and building them to fit on the spot where they vcan get exact measurements seems like a pretty good idea.